Abstract

In order to identify the origin of the giant isotope effect observed on the magnetic properties of YFe2A4.2compounds (A = H, D) and probe the role of the cell volume difference, we have compared the effect of hydrostatic pressure up to 1.0 GPa on the ferro-antiferromagnetic transitiontemperatures TF-AF and spontaneous magnetization of YFe2D4.2 and YFe2H4.2. Using compressibility value of 0.013 GPa−1 and the remarkably different negative pressure slopes of TF-AF, the existence of critical volume where the ferromagnetism is suppressed at 0 K, VC = 501.7 ± 0.3 3, was demonstrated. This consequently established the crucial role of volume on the huge isotope effect observed on the magnetic properties.

Received 28 November 2012Accepted 11 March 2013Published online 29 March 2013

Acknowledgments:

The financial support of the Project P204/12/0692 GA CR and that of the CNRS-ASRT cooperation program are warmly acknowledged. The CNRS interdisciplinary energy program PR09-3.1.1.2 COREMAG is also warmly acknowledged for financial support.

Key Topics

[Magnets or magnetic bodies characterised by the
magnetic materials therefor; Selection of materials for their magnetic
properties, Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties]